feat(vpcv2): add BYOIP for IPv6 functionality

[Leo10Gama]

Reason for this change

This change surfaces aspects of the IPv6-related fields of the VPC L1. In doing so, customers are able to make use of BYOIP for IPv6.

Description of changes

Added additional props for IPv6 pool and IPv6 CIDR blocks, as well as updated the README to contain information on bringing your own IP address to AWS and implementing it in CDK.

Description of how you validated changes

Included unit tests with the fields being used. Unfortunately, due to validation from EC2 on IPv6 addresses, it is difficult to set up a proper and sustainable integration test. Nevertheless, an integration test has been included using a provided IPv6 address.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter has failed. See the aws-cdk-automation comment below for failure reasons. If you believe this pull request should receive an exemption, please comment and provide a justification.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.66%. Comparing base (ca01a25) to head (bdb447c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32397   +/-   ##
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  Coverage   78.66%   78.66%           
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  Files         107      107           
  Lines        7237     7237           
  Branches     1329     1329           
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  Hits         5693     5693           
  Misses       1358     1358           
  Partials      186      186           

Flag	Coverage Δ
suite.unit	78.66% <ø> (ø)

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Components	Coverage Δ
packages/aws-cdk	78.66% <ø> (ø)

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Features must contain a change to an integration test file and the resulting snapshot.

PRs must pass status checks before we can provide a meaningful review.

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[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: bea61a9
• Result: FAILED
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[shikha372]

closing in favour of #32927

[github-actions]

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